为了在病理嗓音识别中为特征参数选择提供依据,提出声带非对称力学建模仿真病变声带并进行分析研究。依据声带的分层结构和组织特性,建立声带力学模型,耦合声门气流,求取模型输出的声门源激励波形。采用遗传粒子群-拟牛顿结合优化算法(G...为了在病理嗓音识别中为特征参数选择提供依据,提出声带非对称力学建模仿真病变声带并进行分析研究。依据声带的分层结构和组织特性,建立声带力学模型,耦合声门气流,求取模型输出的声门源激励波形。采用遗传粒子群-拟牛顿结合优化算法(Genetic particle swarm optimization based on quasi-Newton method,GPSO-QN)将模型输出的声门源和实际目标声门波相匹配,提取优化模型参数。仿真实验结果表明,该声带模型能产生与实际声门源相一致的声门波形,同时也证明了左右声带生理组织间的非对称性是产生病理嗓音的重要原因。展开更多
Human phonation does not merely depend on the vibration of the vocal folds. Research by clinical and computer simulations has demonstrated that the false vocal fold (FVF) is an important laryngeal con-striction that p...Human phonation does not merely depend on the vibration of the vocal folds. Research by clinical and computer simulations has demonstrated that the false vocal fold (FVF) is an important laryngeal con-striction that plays a vital role during human voice production. This study explored the effects of the FVF gaps using both the three-dimensional Plexiglas model and the numerical computation methods. Twelve FVF gaps (ranging from 0.02 to 2.06 cm) were used in this study at three glottal angles (uniform and convergent/divergent 40°), two minimal glottal diameters (Dg) (0.04 cm and 0.06 cm) separately, and the constant subglottal pressure (8 cm H2O). The results suggested that (1) the intralaryngeal pressure was the lowest and the flow was the highest (least flow resistance) when the FVF gap was 1.5-2 times greater than Dg; (2) the divergent glottal angle gave lower pressure and greater flow than the conver-gent and uniform glottal angle as there were no FVF conditions; (3) the presence of the FVF decreased the effects of the glottal angle to a certain extent; and more importantly, (4) the presence of the FVF also moved the separation points downstream, straightened the glottal jet for a longer distance, decreased the overall laryngeal resistance, and reduced the energy dissipation, suggesting the significance of FVF in efficient voice production. These results may be incorporated in the phonatory models (physical or computational) for better understanding of vocal mechanics. The results might also be helpful in exploring the surgical and rehabilitative intervention of related voice problems.展开更多
Vocal fold geometry plays an important role in human phonation. The intraglottal quasi-steady pressure; velocity distributions depend upon the shape, size,; diameter of the glottis. This study reports the effects of t...Vocal fold geometry plays an important role in human phonation. The intraglottal quasi-steady pressure; velocity distributions depend upon the shape, size,; diameter of the glottis. This study reports the effects of the variation of glottal shapes on intraglottal pressures; velocities using a Plexiglas model with a glottis having nine symmetric glottal angles (uniform, as well as convergent; divergent 5°, 10°, 20°; 40°), while the minimal glottal diameter was held constant at 0.06 cm. The empirical data were supported by penalty finite element computational results. The results suggest that larger convergent glottal angles correspond to increased pressures; decreased velocities in the glottis upstream of the minimum glottal location, with a reversal of this pattern at the minimal glottal diameter location. The pressure dip near the glottal entrance for divergent glottal angles was greatest for the 10° divergence angle condition,; was sequentially less for 5°, 20°,; 40°. Flow resistance was greater for a convergent angle than a divergent angle of the same value,; least for the 10° divergent condition. Pressure recovery in the glottis suggested that the optimal glottal diffuser angle was near 10°. Results suggest that the glottal geometry has a critical relationship with phonation (especially for vocal efficiency),; therefore important significance to understanding artistic voice; clinical voice management.展开更多
文摘为了在病理嗓音识别中为特征参数选择提供依据,提出声带非对称力学建模仿真病变声带并进行分析研究。依据声带的分层结构和组织特性,建立声带力学模型,耦合声门气流,求取模型输出的声门源激励波形。采用遗传粒子群-拟牛顿结合优化算法(Genetic particle swarm optimization based on quasi-Newton method,GPSO-QN)将模型输出的声门源和实际目标声门波相匹配,提取优化模型参数。仿真实验结果表明,该声带模型能产生与实际声门源相一致的声门波形,同时也证明了左右声带生理组织间的非对称性是产生病理嗓音的重要原因。
基金the National Natural Science Foundation of China (Grant No. 30770544)the National Postdoctoral Science Foundation of China (Grant No. 200704211131)
文摘Human phonation does not merely depend on the vibration of the vocal folds. Research by clinical and computer simulations has demonstrated that the false vocal fold (FVF) is an important laryngeal con-striction that plays a vital role during human voice production. This study explored the effects of the FVF gaps using both the three-dimensional Plexiglas model and the numerical computation methods. Twelve FVF gaps (ranging from 0.02 to 2.06 cm) were used in this study at three glottal angles (uniform and convergent/divergent 40°), two minimal glottal diameters (Dg) (0.04 cm and 0.06 cm) separately, and the constant subglottal pressure (8 cm H2O). The results suggested that (1) the intralaryngeal pressure was the lowest and the flow was the highest (least flow resistance) when the FVF gap was 1.5-2 times greater than Dg; (2) the divergent glottal angle gave lower pressure and greater flow than the conver-gent and uniform glottal angle as there were no FVF conditions; (3) the presence of the FVF decreased the effects of the glottal angle to a certain extent; and more importantly, (4) the presence of the FVF also moved the separation points downstream, straightened the glottal jet for a longer distance, decreased the overall laryngeal resistance, and reduced the energy dissipation, suggesting the significance of FVF in efficient voice production. These results may be incorporated in the phonatory models (physical or computational) for better understanding of vocal mechanics. The results might also be helpful in exploring the surgical and rehabilitative intervention of related voice problems.
基金supported by the National Natural Science Foundation of China(Grant Nos.30070212&69925101)the National Institutes of Health of America(Grant No.2 R01 DC03577).
文摘Vocal fold geometry plays an important role in human phonation. The intraglottal quasi-steady pressure; velocity distributions depend upon the shape, size,; diameter of the glottis. This study reports the effects of the variation of glottal shapes on intraglottal pressures; velocities using a Plexiglas model with a glottis having nine symmetric glottal angles (uniform, as well as convergent; divergent 5°, 10°, 20°; 40°), while the minimal glottal diameter was held constant at 0.06 cm. The empirical data were supported by penalty finite element computational results. The results suggest that larger convergent glottal angles correspond to increased pressures; decreased velocities in the glottis upstream of the minimum glottal location, with a reversal of this pattern at the minimal glottal diameter location. The pressure dip near the glottal entrance for divergent glottal angles was greatest for the 10° divergence angle condition,; was sequentially less for 5°, 20°,; 40°. Flow resistance was greater for a convergent angle than a divergent angle of the same value,; least for the 10° divergent condition. Pressure recovery in the glottis suggested that the optimal glottal diffuser angle was near 10°. Results suggest that the glottal geometry has a critical relationship with phonation (especially for vocal efficiency),; therefore important significance to understanding artistic voice; clinical voice management.
